[R] Math Expression and Variable Value in Title

[Wolfgang Viechtbauer]

Hello All,

I am trying to put a math expression into a plot title and at the same
time, I want a value in the title to depend on a variable that I set
earlier.

Simple Example:

n <- 20
plot(0, 0)
title(expression(paste(n[i], " = ", n)))

Obviously, I want "n_i = 20". How can I get that?

Thanks in advance,

-- 
Wolfgang Viechtbauer